What should one do before transmitting by radio?

Before transmitting by radio, it is essential to ensure that the channel is not being used. This practice serves multiple critical functions in radio communication. First, it prevents interruptions and confusion, allowing for clear and efficient communication. If the channel is already occupied, your transmission could disrupt an ongoing conversation, leading to potential safety issues or misunderstanding of important information.

By checking that the channel is clear, the operator can communicate their message effectively without interfering with other important messages or instructions that may be in progress. This step is a fundamental aspect of good radio etiquette and operational safety, ensuring that all parties can transmit and receive information without overlap or interference.

While it is also important to prepare messages in advance and maintain connections with crew members, these steps are secondary to the necessity of securing an unobstructed communication channel.